FR3131377B1 - Phase contrast imaging method for estimating the local stoichiometry of a sample. - Google Patents

Phase contrast imaging method for estimating the local stoichiometry of a sample. Download PDF

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Publication number
FR3131377B1
FR3131377B1 FR2114352A FR2114352A FR3131377B1 FR 3131377 B1 FR3131377 B1 FR 3131377B1 FR 2114352 A FR2114352 A FR 2114352A FR 2114352 A FR2114352 A FR 2114352A FR 3131377 B1 FR3131377 B1 FR 3131377B1
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France
Prior art keywords
sample
determining
barycenter
local
estimating
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Active
Application number
FR2114352A
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French (fr)
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FR3131377A1 (en
Inventor
Philippe Zeitoun
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Ecole Nat Superieure Des Techniques Avancees
ECOLE POLYTECH
Centre National de la Recherche Scientifique CNRS
Ecole Polytechnique
Ecole Nationale Superieure des Techniques Avancees Bretagne
Original Assignee
Ecole Nat Superieure Des Techniques Avancees
ECOLE POLYTECH
Centre National de la Recherche Scientifique CNRS
Ecole Polytechnique
Ecole Nationale Superieure des Techniques Avancees Bretagne
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Application filed by Ecole Nat Superieure Des Techniques Avancees, ECOLE POLYTECH, Centre National de la Recherche Scientifique CNRS, Ecole Polytechnique, Ecole Nationale Superieure des Techniques Avancees Bretagne filed Critical Ecole Nat Superieure Des Techniques Avancees
Priority to FR2114352A priority Critical patent/FR3131377B1/en
Priority to PCT/EP2022/084261 priority patent/WO2023117376A1/en
Publication of FR3131377A1 publication Critical patent/FR3131377A1/en
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Publication of FR3131377B1 publication Critical patent/FR3131377B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
    • G01N23/041—Phase-contrast imaging, e.g. using grating interferometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
    • G01N23/083—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the radiation being X-rays
    • G01N23/087—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the radiation being X-rays using polyenergetic X-rays

Abstract

L’invention concerne un procédé d’imagerie par contraste de phase pour estimer la stœchiométrie locale d’un échantillon en déterminant un paramètre δ d’une partie réelle et une partie imaginaire β d’un indice optique complexe de l’échantillon ; ce procédé est mis en œuvre en utilisant une source de rayons X pour illuminer l’échantillon disposé entre la source et un détecteur, une grille constituée de trous disposée entre l’échantillon et le détecteur, et une unité de traitement des signaux provenant du détecteur ; le procédé comprenant les étapes suivantes : - réalisation d’au moins une mesure en illuminant l’échantillon, les rayons X atteignant le détecteur forment une tâche pour chaque trou de la grille, - pour chaque mesure et pour chaque trou de la grille, analyse indépendante de la tâche formée sur la grille en déterminant un barycentre de la tâche en utilisant une technique de recherche de centroïdes, - détermination d’un décalage du barycentre par rapport à un barycentre de référence puis détermination d’une variation de phase locale à partir du décalage du barycentre, - détermination d’une amplitude des rayons X formant la tâche puis détermination d’une atténuation locale par rapport à une amplitude de référence, - détermination du paramètre δ à partir de la variation de phase locale, et - détermination de la partie imaginaire β à partir de l’atténuation locale. Figure pour l’abrégé : Fig. 1A phase contrast imaging method for estimating the local stoichiometry of a sample by determining a parameter δ of a real part and an imaginary part β of a complex optical index of the sample; this method is implemented using an ; the method comprising the following steps: - carrying out at least one measurement by illuminating the sample, the X-rays reaching the detector form a spot for each hole in the grid, - for each measurement and for each hole in the grid, analysis independent of the task formed on the grid by determining a barycenter of the task using a centroid search technique, - determining an offset of the barycenter relative to a reference barycenter then determining a local phase variation from of the shift of the barycenter, - determination of an amplitude of the the imaginary part β from the local attenuation. Figure for abstract: Fig. 1

FR2114352A 2021-12-23 2021-12-23 Phase contrast imaging method for estimating the local stoichiometry of a sample. Active FR3131377B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR2114352A FR3131377B1 (en) 2021-12-23 2021-12-23 Phase contrast imaging method for estimating the local stoichiometry of a sample.
PCT/EP2022/084261 WO2023117376A1 (en) 2021-12-23 2022-12-02 Phase-contrast imaging method for estimating the local stoichiometry of a sample

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2114352A FR3131377B1 (en) 2021-12-23 2021-12-23 Phase contrast imaging method for estimating the local stoichiometry of a sample.
FR2114352 2021-12-23

Publications (2)

Publication Number Publication Date
FR3131377A1 FR3131377A1 (en) 2023-06-30
FR3131377B1 true FR3131377B1 (en) 2024-04-19

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Application Number Title Priority Date Filing Date
FR2114352A Active FR3131377B1 (en) 2021-12-23 2021-12-23 Phase contrast imaging method for estimating the local stoichiometry of a sample.

Country Status (2)

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FR (1) FR3131377B1 (en)
WO (1) WO2023117376A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005009206A2 (en) 2003-06-25 2005-02-03 Besson Guy M Dynamic multi-spectral imaging system
WO2014100063A1 (en) * 2012-12-21 2014-06-26 Carestream Health, Inc. Medical radiographic grating based differential phase contrast imaging
US9724063B2 (en) * 2012-12-21 2017-08-08 Carestream Health, Inc. Surrogate phantom for differential phase contrast imaging
US8855395B2 (en) * 2013-01-02 2014-10-07 Carestream Health, Inc. Conditional likelihood material decomposition and methods of using the same

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Publication number Publication date
FR3131377A1 (en) 2023-06-30
WO2023117376A1 (en) 2023-06-29

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